Newman's character has a few similarities with Lew Harper, the private eye played by Newman in
Détective privé (1966) and
La toile d'araignée (1975). It is quite possible that "Twilight" is meant to be an unofficial end to the saga of Harper. Newman said he liked returning to his old characters, he did it with Eddie Felson in
La couleur de l'argent (1986) 25 years after
L'arnaqueur (1961) with great success. Lew Harper was the movie version of Lew Archer, the protagonist in Ross MacDonald's famous novels. In "Twilight", Newman plays Harry Ross, which is probably a nod to MacDonald. Gene Hackman played a detective named "Harry Moseby" in
La fugue (1975), also based on a P.I. created by Ross MacDonald.